Thanks for the input, guys. My first thought was that they didn't have factory sunroofs. The lack of headroom from the damn thing was a supporting clue. No company would sell a car in the US with that little headroom! My wife loves this mechanic so we go to him far too often for things, especially because I never have the time to do the work myself. Luckily, the sunroof was a quick side job. Honestly, I know he's never even worked on a VX until I bought this one. He did work on other Isuzu's with factory sunroofs so he believed it was just another Isuzu one. We couldn't find a brand name on it anywhere so that supported his theory, not mine. I'll take it to a pro as I knew I should have when I first bought it. For what it's worth, it is a nice sunroof and great to have... if you can afford to lose 2 inches of headroom.

PS: Why was this moved to non-VX related chit-chat? Isn't a sunroof in a VX a technical discussion... about a VX? Whatever.